9x-9=x+21

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Solution for 9x-9=x+21 equation: 



9x-9=x+21

We move all terms to the left:

9x-9-(x+21)=0

We get rid of parentheses

9x-x-21-9=0

We add all the numbers together, and all the variables

8x-30=0

We move all terms containing x to the left, all other terms to the right

8x=30

x=30/8

x=3+3/4

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